Table 1. Experimental parameters and their levels.
| Sample | parameter | (+1) | (0) | (-1) | -α | +α |
|---|---|---|---|---|---|---|
| A | Temperature (°C) | 100 | 130 | 160 | 70 | 190 |
| B | Time (h) | 4 | 7 | 10 | 1 | 13 |
| C | pH | 4 | 7 | 10 | 1 | 13 |
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